Function unknown_attribute

src/backend/parser/parse_expr.c:355–399

* helper routine for delivering "column does not exist" error message * * (Usually we don't have to work this hard, but the general case of field * selection from an arbitrary node needs it.) */

 * selection from an arbitrary node needs it.)
 */
static void
unknown_attribute(ParseState *pstate, Node *relref, const char *attname,
				  int location)
{
	RangeTblEntry *rte;

	if (IsA(relref, Var) &&
		((Var *) relref)->varattno == InvalidAttrNumber)
	{
		/* Reference the RTE by alias not by actual table name */
		rte = GetRTEByRangeTablePosn(pstate,
									 ((Var *) relref)->varno,
									 ((Var *) relref)->varlevelsup);
		ereport(ERROR,
				(errcode(ERRCODE_UNDEFINED_COLUMN),
				 errmsg("column %s.%s does not exist",
						rte->eref->aliasname, attname),
				 parser_errposition(pstate, location)));
	}
	else
	{
		/* Have to do it by reference to the type of the expression */
		Oid			relTypeId = exprType(relref);

		if (ISCOMPLEX(relTypeId))
			ereport(ERROR,
					(errcode(ERRCODE_UNDEFINED_COLUMN),
					 errmsg("column \"%s\" not found in data type %s",
							attname, format_type_be(relTypeId)),
					 parser_errposition(pstate, location)));
		else if (relTypeId == RECORDOID)
			ereport(ERROR,
					(errcode(ERRCODE_UNDEFINED_COLUMN),
					 errmsg("could not identify column \"%s\" in record data type",
							attname),
					 parser_errposition(pstate, location)));
		else
			ereport(ERROR,
					(errcode(ERRCODE_WRONG_OBJECT_TYPE),
					 errmsg("column notation .%s applied to type %s, "
							"which is not a composite type",
							attname, format_type_be(relTypeId)),
					 parser_errposition(pstate, location)));
	}
}

static Node *
transformIndirection(ParseState *pstate, A_Indirection *ind)